Aluminum foil bag sealing device and sealing detection method

Abstract

The application discloses an aluminum foil bag sealing device, which comprises a sealing mechanism, the sealing mechanism comprises a first sealing press head and a second sealing press head which are oppositely arranged, the first sealing press head and the second sealing press head can approach or move away from each other and form an extrusion area for the aluminum foil bag, and the sealing mechanism further comprises a heat sealing press head which can move to the extrusion area and can heat seal the aluminum foil bag; and a positive and negative pressure mechanism which can approach or move away from the extrusion area and is used for providing positive pressure gas or performing negative pressure air exhaust. The aluminum foil bag sealing device realizes full-automatic bag opening operation of the aluminum foil bag, reduces labor cost and improves production efficiency by arranging the sealing mechanism and the positive and negative pressure mechanism.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of filling, in particular to a full-automatic aluminum foil bag sealing device with twice detection process and a sealing detection method. BACKGROUND

[0002] Product packaging machine is a machine for packaging and sealing containers containing products, which is used to seal and preserve products after they are filled into packaging containers, so as to maintain product quality. There are many materials for making packaging containers, such as paper, plastic, glass, ceramic, metal, composite material, etc. The shapes and physical properties of packaging containers are also different. Aluminum foil has the advantages of moisture-proof, airtight, light-shielding, aroma-preservation, non-toxic and odorless, etc. Moreover, it has elegant silver-white luster and can be processed into beautiful patterns and patterns of various colors, so it is widely used in food, beverage, cigarette, medicine and household commodity industries. The aluminum foil bag sealing machine mainly uses the principle of electromagnetic field induction heating. High-frequency current passes through the induction coil to generate a magnetic field, which generates a large amount of small eddy current, causing the aluminum foil to heat up at a high speed and melt, and the heat sealing is completed after cooling.

[0003] In order to ensure the sealing effect, the container needs to be detected for bag opening. At present, the bag opening detection is mostly manual operation, which requires a lot of manpower, has high cost, is easy to miss or misjudge, and takes a long time and has low efficiency.

[0004] The information disclosed in this BACKGROUND section is only for the purpose of increasing the understanding of the general background of the application and should not be taken as an acknowledgment or any form of suggestion that this information forms prior art that is already known to those of ordinary skill in the art. SUMMARY

[0005] The purpose of the present application is to provide a heat sealing device to solve the problem of low efficiency of bag opening detection process in the prior art.

[0006] To achieve the above purpose, the present application provides an aluminum foil bag sealing device, which comprises a sealing mechanism, the sealing mechanism comprises a first sealing pressure head and a second sealing pressure head arranged oppositely, the first sealing pressure head and the second sealing pressure head can approach or move away from each other and form an extrusion area for the aluminum foil bag, the sealing mechanism further comprises a heat sealing pressure head which can move to the extrusion area and heat seal the aluminum foil bag; a positive and negative pressure mechanism which can approach or move away from the extrusion area and provide positive pressure gas or negative pressure air to the extrusion area.

[0007] In one or more embodiments, the positive and negative pressure mechanism comprises a flat nozzle having a first surface and a second surface opposite to each other, when the first sealing pressure head and the second sealing pressure head approach, the first surface and the second surface respectively fit with the extrusion surfaces of the first sealing pressure head and the second pressure head.

[0008] In one or more embodiments, the positive and negative pressure mechanism comprises a guide needle connected to the flat mouth, the guide needle is received in the flat mouth, and the guide needle is movable to extend into the aluminum foil bag for gas supply and gas extraction.

[0009] In one or more embodiments, the aluminum foil bag sealing device further comprises a pushing mechanism, the pushing mechanism and the positive and negative pressure mechanism are arranged on a rack, and the rack is switched by rotation to enable the positive and negative pressure mechanism or the pushing mechanism to correspond to the extrusion area between the first sealing pressure head and the second sealing pressure head.

[0010] In one or more embodiments, the sealing mechanism further comprises a wrinkle prevention pressure head movable to the second sealing pressure head and capable of extruding the aluminum foil bag to the second sealing pressure head, and the wrinkle prevention pressure head and the first sealing pressure head are arranged on opposite sides of the heat sealing pressure head, respectively.

[0011] In one or more embodiments, the sealing mechanism further comprises a first jaw set and a second jaw set, the first jaw set comprises two first jaws arranged on opposite sides in the moving direction of the aluminum foil bag and capable of approaching and moving away from each other, the second jaw set comprises two second jaws arranged on opposite sides in the moving direction of the aluminum foil bag and capable of approaching and moving away from each other, the two first jaws are arranged on two sides of the wrinkle prevention pressure head, and the two second jaws are arranged on two sides of the first sealing pressure head.

[0012] In one or more embodiments, a sensor for sensing the position of the aluminum foil bag is arranged on the first sealing pressure head or the second sealing pressure head, and / or a gasket is arranged on the upper surface of the second sealing pressure head, and the gasket is arranged at the position when the heat sealing pressure head is in contact.

[0013] In one or more embodiments, a profiled sealing strip is arranged on the extrusion surface of the first sealing pressure head and the second sealing pressure head, respectively.

[0014] In one or more embodiments, the sealing mechanism further comprises a suction module, comprising a suction seat arranged on one side of the second sealing pressure head, a plurality of suction holes arranged on the suction seat, and a plurality of suction heads arranged above the suction holes, and the suction heads are capable of approaching or moving away from the suction holes.

[0015] In one or more embodiments, the sealing mechanism further comprises a bag supporting module set, comprising two bag supporting modules arranged on opposite sides in the moving direction of the aluminum foil bag, each of the bag supporting modules comprises a main body, a bag supporting head arranged on the main body and capable of moving to the extrusion area, and two supporting rods arranged on the bag supporting head and capable of approaching or moving away from each other.

[0016] The application also provides a sealing detection method of the aluminum foil bag sealing device, comprising the following steps:

[0017] S1, placing products into the aluminum foil bag;

[0018] S2, the positive and negative pressure mechanism approaches the extrusion area and inserts the guide needle into the aluminum foil bag;

[0019] S3, the first sealing pressure head and the second sealing pressure head seal the bag opening, the guide needle fills the aluminum foil bag with positive pressure gas and performs pressure preservation, and leakage detection is performed;

[0020] S4, the guide needle performs negative pressure gas extraction on the aluminum foil bag, the guide needle retreats, and the heat sealing pressure head is pressed down to complete the heat sealing of the aluminum foil bag opening;

[0021] S5, the positive and negative pressure mechanism approaches the extrusion area, and the guide needle is inserted into the bag opening of the aluminum foil bag, and the guide needle fills the aluminum foil bag with positive pressure gas and performs pressure preservation, and leakage detection is performed.

[0022] Compared with the prior art, the aluminum foil bag sealing device according to the application realizes automatic operation of the bag opening by setting the sealing mechanism and the positive and negative pressure mechanism, and improves the production efficiency. Secondly, the leak detector and the flat nozzle are integrated in the positive and negative pressure mechanism, which can realize secondary leak detection during the bag opening process, and can detect whether the aluminum foil bag itself and the bag opening exist leakage, thereby replacing manual detection and avoiding missed detection and wrong detection, and further improving the production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a schematic diagram of a pushing mode of the aluminum foil bag heat sealing device according to an embodiment of the application;

[0024] Figure 2 is a schematic diagram of a detection bag opening mode of the aluminum foil bag heat sealing device according to an embodiment of the application;

[0025] Figure 3 is a schematic diagram of a detection bag opening mode of the aluminum foil bag heat sealing device according to an embodiment of the application; Figure 1 is a partial enlarged view of the sealing mechanism in the

[0026] Figure 4 is a schematic diagram of the positive and negative pressure mechanism, the pushing mechanism and the rack according to an embodiment of the application;

[0027] Figure 5 is a schematic diagram of the second jaw group and the suction head forming the bag opening of the aluminum foil bag into a square according to an embodiment of the application;

[0028] Figure 6 is a schematic diagram of the bag opening of the aluminum foil bag opened by the bag supporting module according to an embodiment of the application;

[0029] Figure 7This is a schematic diagram of a pushing mechanism according to an embodiment of the present invention pushing a product into an aluminum foil bag;

[0030] Figure 8 This is a schematic diagram of a positive pressure test of the airtightness of an aluminum foil bag according to an embodiment of the present invention;

[0031] Figure 9 This is a schematic diagram of the negative pressure mode of the positive and negative pressure mechanism according to an embodiment of the present invention, which draws negative pressure into the aluminum foil bag;

[0032] Figure 10 This is a schematic diagram of a heat-sealing pressure head sealing an aluminum foil bag according to an embodiment of the present invention;

[0033] Figure 11 This is a schematic diagram of a secondary positive pressure detection according to an embodiment of the present invention;

[0034] Explanation of key figure labels:

[0035] 100-Aluminum foil bag sealing device; 10-Sealing mechanism; 101-Extrusion area; 11-First sealing head; 12-Second sealing head; 121-Concave portion; 13-Heat sealing head; 14-Anti-wrinkle head; 15-Bag support module; 15a-Body; 15b-Bag support head; 15c-Support rod; 161-First gripper; 162-Second gripper; 17-Sensor; 181-First gasket; 182-Second gasket 183-Shaped sealing strip, 19-Adsorption module, 19a-Adsorption head, 19b-Adsorption hole, 19c-Adsorption seat, 20-Positive and negative pressure mechanism, 21-Flat nozzle, 211-First surface, 212-Second surface, 22-Guide pin, 23-Elastic layer, 30-Frame, 40-Pushing mechanism, 50-Aluminum foil bag, 51-Bag opening, 52-Sealing cavity, 53-Sealing, 60-Production line transfer unit, 70-Product. Detailed Implementation

[0036] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0037] Unless otherwise expressly stated, throughout the specification and claims, the term "comprising" or its variations such as "including" or "comprises" shall be understood to include the stated elements or components without excluding other elements or other components.

[0038] like Figures 1 to 4 As shown, the aluminum foil bag sealing device 100 according to an embodiment of the present invention mainly includes two parts: a sealing mechanism 10 and a positive and negative pressure mechanism 20. The sealing mechanism 10 is used to seal the package containing the product 70 (e.g., ...). Figure 5The positive and negative pressure mechanism 20 carries out two detection operations during the heat sealing of the container (here, an aluminum foil bag 50, of course, other packaging containers are also possible, and the product 70 can be multiple carrier plates stacked up and down), wherein the first detection operation occurs before heat sealing, for detecting whether the aluminum foil bag 50 itself has a leakage, if it has a leakage itself, the subsequent heat sealing of the bag opening 51 is abandoned; the second detection operation occurs after heat sealing is completed, for detecting whether there is a leakage after the bag opening 51 is heat sealed. The whole process is automatically operated by the equipment, greatly reducing the labor cost, avoiding the wrong detection and missing detection, and greatly improving the production efficiency.

[0039] Specifically, the sealing mechanism 10 mainly includes a first sealing pressure head 11 and a second sealing pressure head 12 arranged oppositely, and a heat sealing pressure head 13. In this embodiment, the first sealing pressure head 11 is arranged above the second sealing pressure head 12, and the two can be close to each other to constitute a pressing area 101 for the aluminum foil bag. The heat sealing pressure head 13 is also arranged above the second sealing pressure head 12 and can also move towards the second sealing pressure head 12.

[0040] Preferably, a wrinkle prevention pressure head 14 is further arranged above the second sealing pressure head 12. As Figure 3 shown, the first sealing pressure head 11, the heat sealing pressure head 13 and the wrinkle prevention pressure head 14 are arranged in sequence above the second sealing pressure head 12, and the first sealing pressure head 11 and the wrinkle prevention pressure head 14 are arranged on both sides of the heat sealing pressure head 13 and press the aluminum foil bag 50 from both sides to ensure that the aluminum foil bag 50 below the heat sealing pressure head 13 is in a flat state, preventing the aluminum foil bag 50 from being wrinkled during the sealing process to affect the sealing effect and improve the appearance.

[0041] Preferably, a profiled sealing strip 183 is arranged on the pressing surface of the first sealing pressure head 11 and the second sealing pressure head 12 (due to the angle of view, Figure 3 only the profiled sealing strip 183 located on the second sealing pressure head 12 is shown), for improving the sealing effect during pressing to prevent leakage.

[0042] Further, a first gasket 181 is arranged on the second sealing pressure head 12, which corresponds to the position of the heat sealing pressure head 13 and replaces the direct contact between the second sealing pressure head 12 and the heat sealing pressure head 13, for improving the heat sealing effect. It is easy to think that the profiled sealing strip 183 and the first gasket 181 can be replaced.

[0043] It is easy to think that a second gasket 182 can be arranged at the end of the wrinkle prevention pressure head 14 for improving the contact and pressing sealing effect of the wrinkle prevention pressure head 14 and the aluminum foil bag 50.

[0044] As Figure 3As shown, the first and second clamping jaw groups are respectively arranged on both sides of the second sealing head 12, and each of the first and second clamping jaw groups comprises two first clamping jaws 161 and two second clamping jaws 162 arranged on opposite sides of the aluminum foil bag moving direction and capable of approaching and moving away from each other (only one first clamping jaw 161 and one second clamping jaw 162 are shown in the figure due to the viewing angle), the two first clamping jaws 161 are arranged on both sides of the anti-wrinkle head 14, and the two second clamping jaws 162 are arranged on both sides of the first sealing head 11. The first and second clamping jaw groups are driven by a gas cylinder and are respectively used to pull the middle position of the aluminum foil bag 50 and the edge position of the aluminum foil bag 50 to both sides of the bag opening 50 after the product 70 is filled. The first and second clamping jaw groups can make the overall aluminum foil bag 50 and the bag opening 51 in a relatively flat state by increasing the pulling action of the aluminum foil bag 50 away from each other, compared with the case where the first sealing head 11 and the second sealing head 12 directly act on the irregular aluminum foil bag 50 without such action, which can effectively avoid the situation that wrinkles cause poor sealing effect, and improve the appearance of the bag opening 51.

[0045] Preferably, the first sealing head 11 is further provided with a sensor 17, which sends a signal to the aluminum foil bag sealing device 100 when the aluminum foil bag 50 is sensed, triggering the operation of the aluminum foil bag sealing device 100 on the aluminum foil bag 50 to enter the next step of detection and heat sealing operation. Of course, the sensor can also be arranged on the second sealing head 12.

[0046] Preferably, the sealing mechanism 10 further comprises a suction module 19 for opening the bag opening 51 of the aluminum foil bag 50. The suction module 19 comprises a plurality of suction heads 19a and a plurality of suction holes 19b, the suction heads 19a are arranged adjacent to the first sealing head 11, and the plurality of suction holes 19b are arranged on a suction seat 19c, the suction seat 19c is arranged adjacent to the second sealing head 12, when the aluminum foil bag 50 stops between the suction heads 19a and the suction holes 19b, the suction heads 19a can move towards the suction seat 19c, the suction heads 19a and the suction holes 19b respectively adsorb the upper and lower surfaces of the bag opening 51, and the displacement of the suction heads away from the suction seat makes the bag opening 51 open, thereby opening the space formed by the aluminum foil bag 50.

[0047] Preferably, the sealing mechanism 10 further comprises a bag opening module set for fixing the bag opening 51 of the aluminum foil bag 50. The bag opening module set comprises two oppositely arranged bag opening modules 15, each of which comprises a body 15a, a bag opening head 15b and two supporting rods 15c. When the bag opening 51 is opened, the two bag opening modules 15 act synchronously, the body 15a extends the bag opening head 15b to extend the supporting rods 15c into the bag opening 51, and the two bag opening heads 15b drive the two supporting rods 15c away from each other, so that the supporting rods 15c open the bag opening 51 from the inside, and the four supporting rods 15c open the bag opening 51, thereby ensuring the opening size of the bag opening 51, so that the product 70 can smoothly enter the aluminum foil bag 50 from the bag opening 51.

[0048] Preferably, the positive and negative pressure mechanism 20 is fixed on the frame 30 for air supply and air extraction of the aluminum foil bag 50. As shown in Figure 8 The positive and negative pressure mechanism 20 comprises a flat nozzle 21 and a guide needle 22. The flat nozzle 21 has opposite first and second surfaces 211 and 212, and the first and second sealing heads 11 and 12 are pressed on the first and second surfaces 211 and 212, respectively, when they are close to each other. The guide needle 22 is accommodated in the flat nozzle 21 in the normal state, and can be extended into the aluminum foil bag 50 for air supply and air extraction when detection is needed.

[0049] Preferably, the first and second sealing heads 11 and 12 form concave portions corresponding to the position of the flat nozzle 21 (only the concave portion 121 on the second sealing head 12 is shown in the figure due to the viewing angle), and the two sealing heads can cover the flat nozzle 21 after approaching and contacting, so as to improve the fitting and sealing effect of the aluminum foil bag and avoid air leakage.

[0050] Preferably, the frame 30 is further provided with a pushing mechanism 40, and the frame 30 is rotatable. When detection and air extraction are performed, the positive and negative pressure mechanism 20 can approach or move away from between the first and second sealing heads 11 and 12, and complete the detection and air extraction operation; when the product 70 is placed, the frame 30 is rotated so that the pushing mechanism 40 corresponds to one side of the aluminum foil bag 50, and the pushing mechanism 40 can push the product 70 into the aluminum foil bag 50.

[0051] In this embodiment, the frame 30 can be rotated to a specific angle position, and the positive and negative pressure mechanism 20 and the pushing mechanism 40 are arranged at both ends of the frame 30. The positive and negative pressure mechanism 20 and the pushing mechanism 40 on the frame 30 are switched by rotation to realize different operation functions.

[0052] The sealing detection method based on the aluminum foil bag sealing device 100 is described in detail herein, which mainly comprises the following steps:

[0053] S1, the product is placed in an aluminum foil bag;

[0054] S2, the positive and negative pressure mechanism approaches the extrusion area and inserts the guide needle into the aluminum foil bag;

[0055] S3, the first and second sealing heads seal the bag opening, the guide needle fills the aluminum foil bag with positive pressure gas and performs pressure retention, and leakage detection is performed;

[0056] S4, the guide needle performs negative pressure gas extraction on the aluminum foil bag, the guide needle is withdrawn, and the heat sealing head is lowered to complete the heat sealing of the aluminum foil bag opening;

[0057] S5, the positive and negative pressure mechanism approaches the extrusion area, and the guide needle extends into the bag opening of the aluminum foil bag. After filling the aluminum foil bag opening with positive pressure gas to the heat sealing position and pressure retention, leakage detection is performed.

[0058] Before the product is put into the bag, a pre-operation is also included, that is, the robot runs to the stock bin, sucks the aluminum foil bag 50 after scanning the code and measuring the height, puts the aluminum foil bag 50 into the labeling platform, the robot runs to the label outlet of the printer to suck the label and paste it on the aluminum foil bag 50, and the code is scanned to compare the label information. This is the general operation process, which will not be described in detail here.

[0059] Referring to Figure 3 and Figures 5-11 , step S1 is the product entering the bag operation. First, the aluminum foil bag 50 is set on the conveying unit 60 of the assembly line to be conveyed. When the aluminum foil bag 50 approaches the sensor 17, the conveying unit 60 of the assembly line is triggered to stop, so that the aluminum foil bag 50 stays below the suction head 19a. At the same time, the bag opening 51 is aligned with the suction head 19a. The plurality of suction heads 19a are lowered to suck the upper and lower edges of the bag opening 51 through the suction holes 19b arranged opposite to the suction heads 19a. Then, the bag opening 51 is opened upward. Then, the bag supporting module 15 extends the supporting rods 15c to open the bag opening 51 into a mouth-shaped form. The bag supporting module 15 is arranged on the other side of the second sealing head 12 relative to the conveying unit 60 of the assembly line. The bag supporting module 15 is arranged on both sides of the aluminum foil bag 50 and adjacent to the bag opening 51. The bag supporting module 15 includes a body 15a fixed to the carrier, and the body 15a is connected with the bag supporting head 15b. The bag supporting head 15b is provided with two supporting rods 15c. When the bag opening 51 is opened, the body 15a extends the bag supporting head 15b to make the supporting rods 15c enter the space of the bag opening 51. Then, the supporting rods 15c are away from each other to abut against the upper and lower edges of the bag opening 51, respectively, so as to flatten and open the bag opening 51. At the same time, the second jaw group 162 clamps the two edges of the bag opening 51 of the aluminum foil bag 50 and moves to a specific position, so that the bag opening 51 can effectively maintain a fixed shape. Similarly, after the first jaw group 161 clamps the middle part of the aluminum foil bag 50, the first jaw group 161 approaches each other to make the bag opening 51 into a square shape, so as to expand the opening size, which is convenient for subsequent loading of the product 70 into the aluminum foil bag 50. Subsequently, please refer to Figure 3 andFigure 6 , 7 As shown, upon entering the packaging stage, after sensor 17 detects aluminum foil bag 50 and completes opening bag opening 51, product 70 is pushed into a specific position inside aluminum foil bag 50. Product 70 is transported to bag opening 51 by the previous station's assembly line transfer unit, and part of product 70 enters the space of bag opening 51. Then, pushing mechanism 40 extends to push product 70 into aluminum foil bag 50. Next, second gripper group 162 releases the edge of aluminum foil bag 50, and pushing mechanism 40 pushes product 70 along with aluminum foil bag 50, so that bag opening 51 of aluminum foil bag 50 stops at a position that sensor 17 just cannot detect. At this time, the edge of bag opening 51 is roughly aligned with the first sealing head 11 or the second sealing head 12.

[0060] After the product is bagged, proceed to step S2. Please refer to... Figure 2 , Figure 3 and Figure 8 As shown, after the pushing mechanism 40 completes the product insertion into the bag, it resets and the frame 30 rotates 180 degrees to exchange the positions of the pushing mechanism 40 and the positive and negative pressure mechanism 20, so that the flat nozzle 21 is inserted into the aluminum foil bag 50 to the sealing position. The flat nozzle 21 is located between the first sealing head 11 and the second sealing head 12, and the guide needle 22 extends into the aluminum foil bag 50.

[0061] Then, in step S3, a positive pressure test is performed. The first gripper 161 and the second gripper 162 move away from the sides of the aluminum foil bag 50, flattening the bag opening 51. The first sealing head 11 and the second sealing head 12 close together. Under the pressure of the first sealing head 11 and the second sealing head 12, the flat nozzle 21 and the contour sealing strip 183 press and seal the bag opening 51 of the aluminum foil bag 50, forming an independent sealed cavity 52. In a preferred embodiment, the flat nozzle 21 can be made of metal, and the outer layer of the flat nozzle 21 is covered with an elastic layer 23, such as rubber. After the flat nozzle 21 is inserted into the opening 51 of the aluminum foil bag 50, the elastic layer 23 of the flat nozzle 21 can be tightly attached to the opening 51 of the aluminum foil bag 50. Then, the contour sealing strip 183 presses the opening 51 of the aluminum foil bag 50 outside the flat nozzle 21 against the first sealing head 11 and the second sealing head 12, improving the airtightness and preventing gas leakage from the opening 51 of the aluminum foil bag 50. Continuing from the above, the guide needle 22 delivers gas (such as...) into the sealed cavity 52. Figure 8 (As shown by the middle arrow), and begin the test. During the test, positive pressure gas is supplied into the aluminum foil bag 50 according to the set conditions. When the equipment inflation time is reached, the aluminum foil bag 50 is pressurized for a period of time to equalize the gas pressure in the sealed cavity 52. ​​After the pressure holding time is reached, the current gas pressure value in the sealed cavity 52 is saved, and the leak test enters the leak detection period.

[0062] During the test, the positive and negative pressure mechanism 20 can be connected to the testing instrument to record the air pressure value at the end of the leak test and automatically calculate the difference between the pressure value after the leak test period and the holding pressure value. This pressure difference is the leakage value of the sealed cavity 52. ​​When the pressure difference is greater than a certain threshold, it can be determined that the aluminum foil bag 50 has a problem of being damaged and leaking air. Conversely, when the pressure difference is less than a certain threshold, the aluminum foil bag 50 is in a normal state. By judging the pressure difference, the experimental error of the leak test of the aluminum foil bag 50 itself and the pressure difference caused by the bag damage to the gas leak can be accurately distinguished, and the abnormality of the aluminum foil bag 50 being damaged can be accurately and quickly eliminated.

[0063] After one positive pressure test is completed, proceed to step S4. Please refer to... Figure 3 and Figure 9 As shown, after a successful positive pressure test, the positive / negative pressure mechanism 20 switches to negative pressure mode, drawing negative pressure into the aluminum foil bag 50. Please refer to... Figure 10 As shown, after the vacuum pressure reaches the set value, the guide pin 22 retracts, and the anti-wrinkle pressure head 14 moves down to ensure the flatness of the bag opening 51 during sealing. Under negative pressure, after the pressure is maintained and stabilized for a period of time, the heat-sealing pressure head 13 moves down and presses the aluminum foil bag 50 tightly. The heat-sealing pressure head 13 can heat up rapidly to reach the melting point of the aluminum foil bag 50. Under pressure, the bag opening 51 of the aluminum foil bag 50 is heat-fused together to form a seal 53.

[0064] For aluminum foil bags 50 and products 70 that fail the positive pressure test, the heat sealing operation is not performed. The production line transmission unit 60 is activated to transport the aluminum foil bags 50 and products 70 that failed the packaging test to the outside of the equipment for manual unloading. At the same time, the equipment alarms to remind the operator that the aluminum foil bags 50 of product 70 have failed the positive pressure test.

[0065] Then refer to Figure 11 Step S5, the secondary positive pressure test stage, is then performed to test the airtightness of the seal 53. The heat-sealing pressure head 13 moves upward. This secondary positive pressure test process is similar to the previous primary positive pressure test. The airtightness of the aluminum foil bag 50 is evaluated by supplying air, maintaining pressure, and testing for leaks on the outer area of ​​the seal 53. After the leak test period ends, the testing instrument measures the pressure value under the pressure-maintaining state and the pressure value at the end of the leak test period. If the difference between the pressure value under the pressure-maintaining state and the pressure value at the end of the leak test period is less than a specific threshold, it indicates that the seal is intact and there is no leakage. Conversely, if the difference between the pressure value under the pressure-maintaining state and the pressure value at the end of the leak test period is greater than a specific threshold, it can be determined that the airtightness of the seal 53 is poor and there is a leakage problem.

[0066] Finally, the product is discharged, and after the second positive pressure detection, the packaged product 70 is conveyed to the outside of the equipment for manual discharge. If the second positive pressure detection fails, the aluminum foil bag 50 and the product 70 are also conveyed to the outside of the equipment for manual discharge, and the equipment alarms to remind the operator.

[0067] In the present embodiment, the positive and negative pressure mechanism mainly uses dry compressed air as the medium, and inflates and pressurizes (or negative pressure) the aluminum foil bag during the semi-automatic or full-automatic leak detection process. After the aluminum foil bag and the compressed air source are cut off, if the aluminum foil bag leaks, the test pressure will inevitably change. By measuring the change in pressure and calculating the pressure change value of the aluminum foil bag, the good and bad judgment of the heat sealing airtightness of the aluminum foil bag on the production line is completed.

[0068] The foregoing description of specific exemplary embodiments of the application is intended to be illustrative only and is not intended to limit the application to the precise forms described. Many modifications and variations are possible in light of the above teachings without departing from the spirit or essential characteristics of the application. The exemplary embodiments were chosen and described in order to explain the principles of the application and its practical application and to allow others skilled in the art to understand the application for various exemplary embodiments and with various modifications as are suited to the particular use contemplated. The scope of the application is intended to be defined by the claims and their equivalents.

Claims

1. An apparatus for sealing an aluminum foil bag, characterized by comprising: The sealing mechanism comprises a first sealing press head and a second sealing press head arranged oppositely, the first sealing press head and the second sealing press head can approach or move away from each other and form an extrusion area for the aluminum foil bag, the sealing mechanism further comprises a heat sealing press head which can move to the extrusion area and heat seal the aluminum foil bag; The positive and negative pressure mechanism can approach or move away from the extrusion area and provide positive pressure gas or negative pressure suction to the extrusion area, the positive and negative pressure mechanism comprises a flat nozzle having a first surface and a second surface arranged oppositely, when the first sealing press head and the second sealing press head approach, the first surface and the second surface respectively contact the extrusion surfaces of the first sealing press head and the second sealing press head, the positive and negative pressure mechanism further comprises a guide needle connected with the flat nozzle, the guide needle is received in the flat nozzle, the guide needle can move to extend into the aluminum foil bag for gas supply and suction; The pushing mechanism and the positive and negative pressure mechanism are arranged on a rack, the rack is switched by rotation to make the positive and negative pressure mechanism or the pushing mechanism correspond to the extrusion area between the first sealing press head and the second sealing press head. The sealing mechanism further comprises an anti-wrinkle press head which can move to the second sealing press head and extrude the aluminum foil bag to the second sealing press head, the anti-wrinkle press head and the first sealing press head are respectively arranged on the two sides of the heat sealing press head.

2. The aluminum foil bag seaming apparatus of claim 1 wherein, The sealing mechanism further comprises a first jaw group and a second jaw group, the first jaw group comprises two first jaws arranged on the opposite sides in the moving direction of the aluminum foil bag and can approach or move away from each other, the second jaw group comprises two second jaws arranged on the opposite sides in the moving direction of the aluminum foil bag and can approach or move away from each other, the two first jaws are arranged on the two sides of the anti-wrinkle press head, and the two second jaws are arranged on the two sides of the first sealing press head.

3. The apparatus of claim 2 wherein, A sensor for sensing the position of the aluminum foil bag is arranged on the first sealing press head or the second sealing press head, and / or 4. The aluminum foil bag sealer as claimed in claim 1, wherein A first gasket is arranged on the upper surface of the second sealing press head, and the first gasket is arranged at the position corresponding to the contact with the heat sealing press head. A profiled sealing strip is arranged on the extrusion surface of the first sealing press head and the second sealing press head respectively.

5. The aluminum foil bag sealer as claimed in claim 1, wherein The sealing mechanism further comprises a suction module, the suction module comprises a suction seat arranged on one side of the second sealing press head, a plurality of suction holes arranged on the suction seat, and a plurality of suction heads arranged above the suction holes, the suction heads can approach or move away from the suction holes.

6. The aluminum foil bag sealer as claimed in claim 1, wherein The sealing mechanism further comprises a bag supporting module group, the bag supporting module group comprises two bag supporting modules arranged on the opposite sides in the moving direction of the aluminum foil bag, each of the bag supporting modules comprises a main body, a bag supporting head arranged on the main body and movable to the extrusion area, and two supporting rods arranged on the bag supporting head and movable to approach or move away from each other.

7. The apparatus of claim 6 wherein, The method comprises the following steps:

8. A seal detection method based on the aluminum foil bag sealing device according to any one of claims 1 to 7, characterized by, S1, placing products into the aluminum foil bag; S2, the positive and negative pressure mechanism approaches the extrusion area and inserts the guide needle into the aluminum foil bag; ​ S3, the first sealing ram and the second sealing ram close the bag opening, the positive pressure gas is filled into the aluminum foil bag through the guide needle, pressure maintaining is performed, and leakage detection is performed; S4, the aluminum foil bag is subjected to negative pressure gas extraction through the guide needle, the guide needle is withdrawn, the heat sealing ram is pressed down to complete heat sealing of the aluminum foil bag opening; S5, the positive and negative pressure mechanism approaches the extrusion area, and the guide needle is extended into the bag opening of the aluminum foil bag, the positive pressure gas is filled into the aluminum foil bag opening to the heat sealing position, pressure maintaining is performed, and leakage detection is performed.

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